US2883270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas analyzers
Assignee: Johnson-Williams Inc
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Filing: 1956-09-17
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Granted: 1959-04-21
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Expires: 1976-09-17
Abstract
No abstract record available.
Inventors
- 👤 Johnson Kenneth Wolcott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:37
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/14; G01N27/18; G01N27/185; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N33/0031; G01N33/0032
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
IN COMBINATION, A WHEATSTONE BRIDGE HAVING A THERMAL FILAMENT IN ONE ARM THEREOF AND A CATALYTIC FILAMENT IN SERIES WITH SAID THERMAL FILAMENT IN AN ADJACENT ARM OF SAID BRIDGE WITH A METER ARRANGED TO INDICATER A BALANCE OF VOLTAGE ACROSS SAID BRIDGE, A FLOW SYSTEM ARRANGED TO CONDUCT A SAMPLE OF AN AIR-GAS MIXTURE PAST BOTH OF SAID FILAMENTS AND MEANS IN SAID FLOW SYSTEM FOR OPTIONALLY CONDUCTING SAID SAMPLE PAST SAID THERMAL FILAMENT ONLY AND ADMITTING AIR TO SAID CATALYTIC FILAMENT TO DERIVE READINGS ON SAID METER TO INDICATE THE CONTENT OF GAS IN SAID MIXTURE.
Claim 2
Dependent Claim
98 words
IN COMBINATION, A WHEATSTONE BRIDGE HAVING A THERMAL FILAMENT IN ONE ARM THEREOF AND A CATALYTIC FILAMENT IN SERIES WITH SAID THERMAL FILAMENT IN AN ADJACENT ARM OF SAID BRIDGE WITH A METER ARRANGED TO INDICATER A BALANCE OF VOLTAGE ACROSS SAID BRIDGE, A FLOW SYSTEM ARRANGED TO CONDUCT A SAMPLE OF AN AIR-GAS MIXTURE PAST BOTH OF SAID FILAMENTS AND MEANS IN SAID FLOW SYSTEM FOR OPTIONALLY CONDUCTING SAID SAMPLE PAST SAID THERMAL FILAMENT ONLY AND ADMITTING AIR TO SAID CATALYTIC FILAMENT TO DERIVE READINGS ON SAID METER TO INDICATE THE CONTENT OF GAS IN SAID MIXTURE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |